Union-coupling check-valve.



BATENTED JUNE' 25, 1907.

- L. M. PATTERSON. UNION COUPLING CHECK VALVE.

APPLICATION FILED JAN. 23, 1906.

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UNlON-COUPLING CHECK-VALVE.

Specification of Letters Patent.

Patented June 25, 1907.

Application filed January 23,1906. Serial No. 297,513.

To all whom it may concern:-

Be it known that I, LoUIs M. PATTERSON, a citizen of the United States,residing at Coalfield,in the county of Morgan and State of Tennessee,have invented certain new and useful Improvements in Union CouplingCheck-Valves, of which the following is a specification. A

This invention relates in general to pipe unions, and is primarilydesigned to equip the same with check valves, whereby the connection ofthe union in a pipe line also fits a check valve thereto.

With this object in view, the present invention consists in thecombination and arrangement of parts as will be hereinafter more fullydescribed, shown in the accompanying drawing and particularly pointedout in the appended claims, it being understood that changes in theform, proportion, size and minor details may be made within the scope ofthe claims without departing from the spirit or sacrificing any of theadvantages of the invention.

Figure 1 is a longitudinal sectional view of a union coupling checkvalve of the present invention. Fig. 2 is a cross sectional view on theline 2-2 of Fig. 1.

The present device includes opposite coupling members 1 and 2respectively, which are tubular and open at opposite ends and of thegeneral form commonly employed in the ordinary type of union couplings.The union members are internally threaded at their outer ends forconnection with the respective pipe sections 3 and 4. The couplingmember 1 is provided at its inner end with an external annular threadedenlargement 5, and this enlarged portion. is provided with an internalannular valve seat 6, with which cooperates a swinging check valve 7which is pivoted or hinged to the interior of the coupling member by anysuitable form of hinge 8. The other coupling member 2 is provided withan external annular shoulder 9 which is rotatably embraced by a sleeveor collar 10, the latter having an internal annular flange 11 engagingthe back of the shoulder 9 so as to swivel the collar or sleeve 10 uponthe coupling member 2. The sleeve or collar 10 is internally threaded atits outer end and projected beyond the coupling member 2 for engagementwith the threaded portion 5 of the coupling member 1, whereby the twoWVhile the present invention is useful in many relations, it has beenspecially designed for use in connection with steam boiler furnaces andthe like, and is arranged to have the coupling member 1 connected to thewater inlet pipe 3, while the other member 2 is connected to the pipe 4,which is in turn connected to a steam boiler or other source of steampressure, whereby the back pressure through the pipe 4 and the couplingmember 2 normally maintains the valve 7 closed. When the steam pressureis relieved or the water pressure increased the valve 7 will, of course,open, thereby permitting the passage of water through the coupling, andwhen the steam pressure is increased or the water pressure decreased thevalve will be automatically closed and the feed of water shut oii andthe escape of steam prevented.

From the foregoing description'it will'be understood that the device ofthe present invention is entirely complete in itself and may be includedin the pipe line in' precisely the same manner as an ordinary union orcoupling, while at the same time it also has the function of a checkvalve. Access may be readily had to the valve for repairs or otherpurposes merely by taking off the sleeve or collar 10 and removing oneor both coupling members in the usual manner.

Having thus described the invention, what is claimed is 1. A unioncoupling comprising a pair of tubular open ended members having theirouter ends adapted for connection with pipes, means for detachablyconnecting the members, one member having an internal valve seat at itsinner end, and a swinging check valve hinged within said member incooperative relation with the seat, whereby the valve is accessible whenthe coupling members are discomiected.

2. A union coupling including a pair of tubular members, one of themembers being provided with an internal annular rabbet in its inner endforming a valve seat, a check valve pivoted upon said member andreceived within the rabbet when closed and cooperating with the seat,and a collar swiveled upon the other member and having a threadedconnection with the first-mentioned member.

3. A combined coupling and check valve including opposite tubular couping members, one of the members having an external rabbet in its innerend forming a valve seat, a check valve pivoted to said member withinthe rabbet and cooperating with the seat, the other member having anexternal annular shoulder, and a collar swiveled upon the shoulder andprovided with an internal annular flange engaging the back of theshoulder, said collar being projected in front of the adjacent memberand internally threaded to engage the threaded portion of the first- 1omentioned member.

In testimony whereof I aflix my signature in presence of two witnesses.

LOUIS M. PATTERSON.

Witnesses JAMES Isl-1AM, H. L. SMITH.

